The Westminster Kennel Club Dog Show competition is fierce but now an owner of a dog that competed is claiming the dog's death is a result of deliberate poisoning at the show.

The adorable Samoyed named GCH CH Polar Mist Cruz'n T'party At Zamosky -- Cruz for short competed in his first Westminster show this year. He reportedly became ill and vomited blood on February 16 at another dog show in Colorado. He died later because of internal bleeding, just four days after the Westminster show.

"I think somebody deliberately poisoned this dog," Cruz's handler, Robert Chaffin, told CNN on Friday.

The owner, Lynette Blue claims the death was due to a slow working poison, much like what is used to kill rats. She said the veterinarian, Molly Comiskey, listed rat poison as a possible cause.

However Chaffin and Blue decided against a necropsy, an autopsy for animals which leave his death as a mystery.

Blue says Comiskey told her a necropsy wouldn't have shown anything if the dog had been poisoned days before. The few she's allowed before all turned up inconclusive, she said.

"Also, the thought at the time of him being cut open was too much for me," Blue said.

"We have never, to our knowledge, had an incident at our show where a dog has become ill or was harmed as a result of being poisoned," the Westminster Dog Show said in a statement this week.

Without the necropsy Cruz's death is left with many unanswered questions and the actual cause of death will remain unknown.